[Gianluca Barbaro]

Hi!
Awesome project!
At first sight, I see some range problems. My advice is to refer to standard melodicas, as shown in the following picture:

Also, some key signatures and following accidentals maybe are a little bit above the average reading skills: what about transposing to some easier tonalities?

Finally, bass melodicas are notoriously problematic: some fast passages might be difficult to render, but I should try and play them first, which I haven’t done yet… 😉

gl